mmc: gen_atmel_mci: add driver model support for mci

Add the driver model support for Atmel mci while retaining the
existing legacy code. This allows the driver to support boards
that have converted to driver model as well as those that have not.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/mmc/Kconfig

@@ -371,6 +371,15 @@ config MMC_SUNXI
 	  This selects support for the SD/MMC Host Controller on
 	  Allwinner sunxi SoCs.
 
+config GENERIC_ATMEL_MCI
+	bool "Atmel Multimedia Card Interface support"
+	depends on DM_MMC && BLK && DM_MMC_OPS && ARCH_AT91
+	help
+	  This enables support for Atmel High Speed Multimedia Card Interface
+	  (HSMCI), which supports the MultiMedia Card (MMC) Specification V4.3,
+	  the SD Memory Card Specification V2.0, the SDIO V2.0 specification
+	  and CE-ATA V1.1.
+
 endif
 
 config TEGRA124_MMC_DISABLE_EXT_LOOPBACK

drivers/mmc/gen_atmel_mci.c

@@ -10,6 +10,7 @@
  */
 
 #include <common.h>
+#include <clk.h>
 #include <mmc.h>
 #include <part.h>
 #include <malloc.h>
@@ -18,8 +19,11 @@
 #include <asm/byteorder.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/hardware.h>
+#include <dm/device.h>
 #include "atmel_mci.h"
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #ifndef CONFIG_SYS_MMC_CLK_OD
 # define CONFIG_SYS_MMC_CLK_OD	150000
 #endif
@@ -37,6 +41,10 @@ struct atmel_mci_priv {
 	struct atmel_mci	*mci;
 	unsigned int		initialized:1;
 	unsigned int		curr_clk;
+#ifdef CONFIG_DM_MMC
+	struct mmc	mmc;
+	ulong		bus_clk_rate;
+#endif
 };
 
 /* Read Atmel MCI IP version */
@@ -58,11 +66,19 @@ static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg)
 }
 
 /* Setup for MCI Clock and Block Size */
+#ifdef CONFIG_DM_MMC
+static void mci_set_mode(struct atmel_mci_priv *priv, u32 hz, u32 blklen)
+{
+	struct mmc *mmc = &priv->mmc;
+	u32 bus_hz = priv->bus_clk_rate;
+#else
 static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
 {
 	struct atmel_mci_priv *priv = mmc->priv;
-	atmel_mci_t *mci = priv->mci;
 	u32 bus_hz = get_mci_clk_rate();
+#endif
+
+	atmel_mci_t *mci = priv->mci;
 	u32 clkdiv = 255;
 	unsigned int version = atmel_mci_get_version(mci);
 	u32 clkodd = 0;
@@ -202,10 +218,18 @@ io_fail:
  * Sends a command out on the bus and deals with the block data.
  * Takes the mmc pointer, a command pointer, and an optional data pointer.
  */
+#ifdef CONFIG_DM_MMC
+static int atmel_mci_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
+			      struct mmc_data *data)
+{
+	struct atmel_mci_priv *priv = dev_get_priv(dev);
+	struct mmc *mmc = mmc_get_mmc_dev(dev);
+#else
 static int
 mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 {
 	struct atmel_mci_priv *priv = mmc->priv;
+#endif
 	atmel_mci_t *mci = priv->mci;
 	u32 cmdr;
 	u32 error_flags = 0;
@@ -335,17 +359,28 @@ mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 	return 0;
 }
 
+#ifdef CONFIG_DM_MMC
+static int atmel_mci_set_ios(struct udevice *dev)
+{
+	struct atmel_mci_priv *priv = dev_get_priv(dev);
+	struct mmc *mmc = mmc_get_mmc_dev(dev);
+#else
 /* Entered into mmc structure during driver init */
 static int mci_set_ios(struct mmc *mmc)
 {
 	struct atmel_mci_priv *priv = mmc->priv;
+#endif
 	atmel_mci_t *mci = priv->mci;
 	int bus_width = mmc->bus_width;
 	unsigned int version = atmel_mci_get_version(mci);
 	int busw;
 
 	/* Set the clock speed */
+#ifdef CONFIG_DM_MMC
+	mci_set_mode(priv, mmc->clock, MMC_DEFAULT_BLKLEN);
+#else
 	mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN);
+#endif
 
 	/*
 	 * set the bus width and select slot for this interface
@@ -374,10 +409,15 @@ static int mci_set_ios(struct mmc *mmc)
 	return 0;
 }
 
+#ifdef CONFIG_DM_MMC
+static int atmel_mci_hw_init(struct atmel_mci_priv *priv)
+{
+#else
 /* Entered into mmc structure during driver init */
 static int mci_init(struct mmc *mmc)
 {
 	struct atmel_mci_priv *priv = mmc->priv;
+#endif
 	atmel_mci_t *mci = priv->mci;
 
 	/* Initialize controller */
@@ -392,11 +432,16 @@ static int mci_init(struct mmc *mmc)
 	writel(~0UL, &mci->idr);
 
 	/* Set default clocks and blocklen */
+#ifdef CONFIG_DM_MMC
+	mci_set_mode(priv, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
+#else
 	mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
+#endif
 
 	return 0;
 }
 
+#ifndef CONFIG_DM_MMC
 static const struct mmc_ops atmel_mci_ops = {
 	.send_cmd	= mci_send_cmd,
 	.set_ios	= mci_set_ios,
@@ -456,3 +501,114 @@ int atmel_mci_init(void *regs)
 
 	return 0;
 }
+#endif
+
+#ifdef CONFIG_DM_MMC
+static const struct dm_mmc_ops atmel_mci_mmc_ops = {
+	.send_cmd = atmel_mci_send_cmd,
+	.set_ios = atmel_mci_set_ios,
+};
+
+static void atmel_mci_setup_cfg(struct atmel_mci_priv *priv)
+{
+	struct mmc_config *cfg;
+	u32 version;
+
+	cfg = &priv->cfg;
+	cfg->name = "Atmel mci";
+	cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+	/*
+	 * If the version is above 3.0, the capabilities of the 8-bit
+	 * bus width and high speed are supported.
+	 */
+	version = atmel_mci_get_version(priv->mci);
+	if ((version & 0xf00) >= 0x300) {
+		cfg->host_caps = MMC_MODE_8BIT |
+				 MMC_MODE_HS | MMC_MODE_HS_52MHz;
+	}
+
+	cfg->host_caps |= MMC_MODE_4BIT;
+	cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
+	cfg->f_min = priv->bus_clk_rate / (2 * 256);
+	cfg->f_max = priv->bus_clk_rate / 2;
+}
+
+static int atmel_mci_enable_clk(struct udevice *dev)
+{
+	struct atmel_mci_priv *priv = dev_get_priv(dev);
+	struct clk clk;
+	ulong clk_rate;
+	int ret = 0;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret) {
+		ret = -EINVAL;
+		goto failed;
+	}
+
+	ret = clk_enable(&clk);
+	if (ret)
+		goto failed;
+
+	clk_rate = clk_get_rate(&clk);
+	if (!clk_rate) {
+		ret = -EINVAL;
+		goto failed;
+	}
+
+	priv->bus_clk_rate = clk_rate;
+
+failed:
+	clk_free(&clk);
+
+	return ret;
+}
+
+static int atmel_mci_probe(struct udevice *dev)
+{
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+	struct atmel_mci_priv *priv = dev_get_priv(dev);
+	struct mmc *mmc;
+	int ret;
+
+	ret = atmel_mci_enable_clk(dev);
+	if (ret)
+		return ret;
+
+	priv->mci = (struct atmel_mci *)dev_get_addr_ptr(dev);
+
+	atmel_mci_setup_cfg(priv);
+
+	mmc = &priv->mmc;
+	mmc->cfg = &priv->cfg;
+	mmc->dev = dev;
+	upriv->mmc = mmc;
+
+	atmel_mci_hw_init(priv);
+
+	return 0;
+}
+
+static int atmel_mci_bind(struct udevice *dev)
+{
+	struct atmel_mci_priv *priv = dev_get_priv(dev);
+
+	return mmc_bind(dev, &priv->mmc, &priv->cfg);
+}
+
+static const struct udevice_id atmel_mci_ids[] = {
+	{ .compatible = "atmel,hsmci" },
+	{ }
+};
+
+U_BOOT_DRIVER(atmel_mci) = {
+	.name = "atmel-mci",
+	.id = UCLASS_MMC,
+	.of_match = atmel_mci_ids,
+	.bind = atmel_mci_bind,
+	.probe = atmel_mci_probe,
+	.priv_auto_alloc_size = sizeof(struct atmel_mci_priv),
+	.ops = &atmel_mci_mmc_ops,
+};
+#endif